Device to prevent unwinding of yarn from bobbins



DEvIcgTo PREVENT UNwINDINGoF YARN FRan'sosIns Filed sept. 10; 1927 51%/ ,22, n?, QH.. K n...

Patented Dec. 18,1928. i l 1,695,318

UNITED sTArEsrArENroFFlcEl ELMER JACOB, OE NORTH ADAMS, MASSACHUSETTS, ASSISNOR Tok CROMPTON .e

KNOWLES LOOM WORKS, or WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS. r 1 Y Y l f DEVICE TO PREVENT 4Urwrrmrrre OE YARN FROM ROBBINS.

Application filed September 10? 1927. Serial No. 218,769.

This invention relates to improvements in Fig. 3 is a detailed horizontal Section on 50 weft replenishing magazines for looms more line 3*8 of Fig. l. f l. particularly though not necessarily of the `Referring tothe drawings the multicolor multicolor type, and it is a general objectoi magazine includes in its construction :inout-- 5 the invention to provide means to prevent side platel lO provided with a plurality 'of the final winds on bobbins awaiting transfer vertical parallel grooves 1l which guide the from unwinding and becoming entangled.. tips T of the bobbins B. Located adjacent In multicolor weft replenishing mechthe bottom of each groove is a cradle l2 the anisms of the "type generally employedthe outer end of which is journaled as4 at 18 to bobbins are arranged inverticall parallel the plate l0.

Stacks and there is a control device .called Under normal conditions the cradles are 60 cradle located at the bottom of each stack. so placedthat thekupper lip 14 thereof lies The end of filling from each bobbin is led acrossthe path which must he i'ollowed by through aslot in the magazine. frame and the bobbinsas they descend towardtransfer extends to athread holder. During the norposition sol that the bobbins of each stack mal operation of the loointhe hobbins are will normally be located above the corre- 65, n

vibrated due to the jar of the loom and the Spending cradle. At the time of indication linal winds ofv the yarn on the bobbins have of weft exhaustion' the cradle of the stack a. tendency to slip off and become entangled. corresponding to the active shuttle, willbe This is particularly true in the kartificial rocked about its axis so that the lipthere-.. yarns such as rayon where there is little natof will pass beyond the adjacent slot andthe 70 ural adhesion of the coils of yarn one for the `stack of loolobins will ifa-ll. `The lowermost other. It is a further `object of my, invenbobbin will be caught on a run l5 of the tion tok provide means connected to the cradle and held until the shuttlewhich gave 2l cradles which shallengage-that part of the the indication of weft exhaustion is againy yarn adjacent the tips of the bobbins to pretoloe picked to that side of the loom where 75 vent the final winds from working loose. l the magazine is located, at which time the It is further found that the bobbins as cradle l.will be rocked back to its normal posi? they await transfer are Subject 'to a: certain tion to release the lowermost bobbin and to 3o amount of Wearingv due to the vibrationand supportv the others lying thereahove. The

relative movement of the bobbins with re-` mattei' thus far describedis of common con- 80 spect to each other. It is another object of struction rand may he substantially the same my present invention to provide` adevice as shown in prior Patent No. A1,030,748 Vto which will engage the hobbins and hold the Ryon. Reference may he had to said patent same against vibration so as to prevent the for thek mechanism for operating the eradlesr relative movement which causes said wear- AS previously stated it is found that cer- 85 ing of the filling. tain yarns 'are prone to unravel so that the With these and other objects in view final winds thereot which are on the conical lwhich will appear as the description propart of the yarn adjacent the bohbintips 40 ceeds, my invention resides in the combinawill slide away from the main bodyoi the tion and arrangement of parts hereinafter-f yarn. In order to prevent the yarn from' 90` described and set forth inthe claims. 'unwi-nding andv also to release the bobbins In the accompanying drawings wherein I Aso that they may. fall without interruption have shown an embodiment of my invention, at the. time the cradle rocks I employ a plm Fig. l is` a central vertical section through ralityiof flexible bobbin engaging elements,.

a multicolor magazine looking V outwardly onefor each staclrotbobbins. Inaemuch as toward the tips of the bobbins, the elements are all th-e samei a description Fig. 2l is a rear elevation looking in the of one will suiiioe for all. .y l direction oarrow 2, Fig. l, and Y I provide each cradle with stud 2O and A Ul attach thereto the lower end ot a flexible strap 2l the upper ond ot which is connected to a tension spring 22 held by means ol screw 23 to the plate l0. rllhe scrciv 23 andV the corresponding stud 20 are so located that the strap 2i will normally extend parallel to and inengagement*with the conical portions ot the adjacent stack ot bobbins as shown at the lett hand side out Fig. l. lllhen in this position the strap 2l will contorni itself to the shape of' the bobbins oi' the corresponding stack and Will act to prevent the last coils of yarn from ,unraveling At the time ot indication ot substantial Wett exhaustion the cradle corresponding to the active shuttle will be rocked as previously described and the stud 20 thereof will be moved away from the stack of bobbins controlled by the cradle to some such a position as that indicated at M in Fig. l. llVhen in this position the strap is out ot contact With the bobbins so that the latter are tree to descend Without interruption or interference on the part of said strap. The tension springs 22 are light and do not interfere in any Way With the proper operation of the cradles. When the cradle returns to its normal position `after the lovvermost bobbin ot the lcorresponding stack has been released the strap will be restored to its normal position in engagement with the conical portion of the yarn adjacent the tips of the bobbins.

From the foregoing it Will be seen that I have provided a very simple means for engaging the conical portions ot the yarn adjacent the tips ofthe bobbins to prevent the same from unraveling. It will further be seen that said means are placed under control of a part of the magazine Which acts in timed relation With the indication of Wett exhaustion. It Willalso be seen that the cradles or gates Which release the lovvermost bobbin ot each stack are effective to move the restraining` yarn engaging element out of contact with the bobbins at such times as the latter are called upon to move downwardly toward transfer position. It is obvious, also, that the engagement of 'the straps With the bobbins tends to prevent vibration of the latter and therefore to reduce the abrasion and Wearing Which results from the vibration of the bobbins. f

Having thus described my invention it will be apparent that changes and modifications may be made therein by those skilled in the art Without departing from the spirit and scope oi. the invention and I do not Wish to be limited to the details herein disclosed, but what I claim is: I Y

l. In a Weit replenishing mechanism, means to guide a stack of bobbins which move tovvard transfer position by gravity, and flexible means resiliently mounted to engage the conical portions ot the yarn on the bobbins adjacent the tips oit the bobbins to prevent the Winds ot yarn adjacent the tips from unvvinding.

2. In a weft replenishing mechanism, means to guide a stack ot bobbins, a cradle located at the bottom oit the stack et bobbins, and means connected to and controlled by the cradle to engage those portions ot the yarn on the bobbins adjacentthe tips ot the latt-er to prevent the final Winds ot yarn from unraveling. i

3. In a Wett replenishing mechanism, means to guide a stack of bobbins, releasing lmeans located adjacent the bottom of the first named means to release the bobbins one at a time, said releasing meansbeing rotatable about an airis, and an element connected to the releasing means and including a flexihle member to have contact with those portions ot the yarn adjacent the tips of the bobbins to prevent unraveling ot the last Winds ott yarn adjacent the tips of bobbins.

l. In a Wett replenishing mechanism having a ramemQans to guide a stack of bobbins, a release cradle at the bottom of the stack of bobbins movable angularly to release the bobbins one at a time, a iiexible bobbin engaging element operatively connected to the cradle and having contact with those portions of the yarn adjacent the tips of the bobbins, and resilient means interposed between the upper end of the element and the Wett replenishing mechanism Jframe tending normally to hold said element against the bobbins. v

5. In a Wett replenishing mechanism, means defining guides for a stack of bobbins, a cradle located at the bottom of the stack rof bobbins and mounted lfor angular movement, a flexible member secured to and moving With the cradleand having Acontact with those portions of the yarnf Wound on the bobbins which are adjacent the tips ot the-bobbins, and a tension spring one end oir' which is secured to theupper end of the member and the other end oi which 'is secured in fixed position relatively to the trame ofthe magazine.

6. In a Wett replenishing mechanism,V

means to guide a stack of bobbins, flexible means to engage those portions ot the yarn on the bobbins adjacent the tipsof the latter to prevent the linal Winds of yarn from unraveling, and means to move the flexible means out of engagement With the yarn on the bobbins.

f 7. In a Wett replenishing ,mechanisnn means to move a stack oli bobbins toward transfer position oneV ata. time, flexible means yieldingly mounted to engage those portions of theyarn on the bobbins adjacentthe tips ol the latter to prevent the lnal Winds ot yarn from unraveling, and mechanism to move said flexible means out of engagement With the yarn on-the bobbins when at bobbin moves toward transfer position.l

8. In a weft replenishing mechanism, means dening a guide along which reserve bohbins move toward transfer'position, flexible mea-ns presenting :L substantially flat surface to engage those portions of the yarn on the bobbins adjacent the tips of the latter to prevent the nal Winds of yarn from unleveling, and a device actuated by the replenishng mechanism to move the second named means away from the guide.v

In testimony whereof l have hereunto affixed my signature. ELMER JACOB.` 

